From Fodors.com online:

“After a day sledding down the largest sand dunes in North America, Piñon Flats, a decidedly un-sandy campground protected by the shade of cottonwood and conifer, is where you want to be. The Great Sand Dunes National Park’s April-October seasonal campground has 88 individual sites and 15 group sites, all of which are framed by views of the dunes and the Sangre de Cristo Mountains in the distance. All campsites require reservations and come complete with fire pits and picnic tables. Each loop of the campground has restrooms with flush toilets and potable water.”

Website: https://www.nps.gov/grsa/planyourvisit/pinonflatscampground.htm